Children should make ______ a rule to wash hands before meals.
The professor walked onto the platform and seated himself in a chair, ____ for answering questions.
Mr Black must be worried about something. You can ____ it from the look on his face.
Many teens don’t get enough sleep because they have too much homework, which ____ them up at night.
____ has recently been done to provide more buses for the people, a shortage of public vehicles remains a serious problem.
——What field will your son go into after graduation from Nanjing University? ——I’m not quite certain, but he ____ a good teacher of English.